JPS6052678B2 - DC compound motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC compound-wound motor, and particularly to a DC compound-wound motor suitable for use in a motor generator for an electric vehicle.

Motor generators used in electric cars are mainly powered directly from overhead wires.

For this reason, the overhead wire voltage fluctuates significantly when other electric vehicles turn on or off, or when a power regeneration vehicle is turned on. However, the frequency (
Due to its nature, the rotation speed) must be kept constant. For this reason, conventional compound-wound electric motors for electric car motor generators have series coils corresponding to approximately 10% of the total excitation ampere turns to improve magnetic flux tracking, and the remaining excitation ampere turns. Turns are divided between the branch winding and separately excited windings, the output frequency of the alternator is detected in response to fluctuations in overhead line voltage, and the excitation current of the separately excited windings is controlled to control speed. . FIG. 1 is a wiring diagram showing the configuration of a motor generator using a conventional DC compound motor.

In Figure 1, a DC compound motor has an armature 1, a commutating pole 2
, a series winding winding 3, a branch winding winding 4, and a separately excited movable winding 5.

The armature 1, the commutating pole 2, and the series winding wire 3 are each connected in series and connected between the pantograph 6 and the ground. Further, a shunt coil 4 is connected in parallel with these through a voltage dividing resistor 7.
On the other hand, the output voltage of the alternator 8 which is mechanically directly connected to the DC compound motor is applied to the separately excited wave winding 5 via the rectifier 9. At this time, the rectifier 9 is ignited by the gate control device 10 to control the conduction rate. In FIG. 1, when the voltage of the overhead wire 11 decreases, the current 1a flowing into the armature 1 increases in order to keep the output of the alternator 8 the same. On the other hand, the current If flowing into the branch winding 4 decreases as the overhead wire voltage decreases, but the current Is flowing into the sum winding 5
If p remains unchanged, the frequency of the alternator 8 will decrease.
Therefore, as shown in FIG. 2, it is necessary to control the gate of the rectifier 9 so as to control the frequency f of the alternating current generator 8 as well as the separately excited currents 1 and p. In general, the other excitation windings of a DC compound motor include a series winding, a branch winding, and a sum winding that acts on summation only, or a sum winding and a differential that acts on differential. There are two types: one that also has a winding.

In other words, there are three types of excitation windings in the DC compound motor in the case of sum control, and four types in the case of sum differential control. As a result, the size and weight of the electric motor increase, and there is a drawback that transient rectification performance is poor when the overhead wire voltage suddenly changes due to the influence of mutual inductance between each winding. In addition,
It has been confirmed that fluctuations in overhead wire voltage reach, for example, as much as 50% at the peak, and the influence on rectification performance is extremely large. An object of the present invention is to divide the shunt winding wire into two and provide an external winding having the same impedance as this to form a bridge, in order to improve transient rectification performance. We will provide a DC compound motor that solves the problem by flowing the current.

FIG. 3 is a circuit diagram showing an embodiment of the present invention when applied to a motor generator. In the embodiment shown in FIG. 3, the same members as those used in FIG. 1 are given the same reference numerals.

The shunt coil is divided into two into 4A and 4B, and an external winding 12 having the same impedance as the divided winding is provided,
These are configured as a bridge configuration. Two opposing terminals of this bridge are connected to a shunt circuit, and the other two opposing terminals are connected to the other excitation circuit of the rectifier 9. Now, when the voltage of the overhead wire 11 is at the reference value, the separately excited current 10 flowing out from the rectifier 9 is zero A, and the output frequency f of the alternator 8 is F as shown in FIG.

Suppose we set it as follows. In this condition, the rack. “
The voltage on line 11 decreases and the frequency f reaches the reference value F. If the voltage drops further, the thyristor 91 of the rectifier 9 is turned on, and the current is passed through the shunt-turn wires 4A and 4B in the opposite direction to the separately excited current and the shunt-winding current. On the other hand, the voltage of the overhead wire 11 increases, and the frequency f reaches the reference value F. If the voltage rises further, the thyristor 92 is ignited and the separately excited current L is shunt-circuited, and the shunt-winding wire 4A,
Apply current to 4B. That is, with respect to the frequency f, the separately excited current controls the gate control circuit 10 and the rectifier 9 as shown in FIG. As is clear from the above, according to the embodiments of the present invention, even when the overhead line voltage suddenly changes,
Since the bridge can be configured with windings of the same impedance, there is no imbalance in the magnetic flux generated by the divided windings, and good transient rectification performance is achieved.

Further, it is possible to design a small and lightweight compound motor having control performance equivalent to that of a conventional compound wound motor having three to four types of excitation windings. As is clear from the above, according to the present invention, it is possible to obtain a compound motor having good transient rectification characteristics.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram showing the configuration of a motor generator using a conventional DC compound motor, Figure 2 is a separately excited winding current vs. AC generator output frequency characteristic diagram, and Figure 3 is a diagram of the motor generator. FIG. 4 is a circuit diagram showing an embodiment of the present invention when applied to the present invention, and FIG. 4 is a diagram showing separately excited current versus alternator output frequency characteristics in the present invention. 1... Armature, 3... Series winding, 4A
, 4B...Shunt winding, 12...External winding.

Claims (1)

[Claims] 1. An armature, a series winding connected to the armature in series,
In a DC compound motor that has these series-connected circuits and a shunt winding connected in parallel, the shunt winding is divided into two parts and each passes a shunt current and separately excited current, and the shunt winding is A DC compound motor comprising an external winding having an impedance equivalent to that of the winding and connecting with the shunt winding to form a bridge circuit. 2. The DC compound motor according to claim 1, wherein the separately excited current is caused to flow when the current of the power supply suddenly changes.